Screw driver



H. J; HARROLD SCREW DRIVER -.F'iled Aug. 4, 1923 H. J: HA/FROLD Imam ATTORNEY Patented Get. 7, 1924.

HARVEY J. HARROLD, OF COLUMBIANA, OHIO.

sonnw DRIVER.

Application filed August 4, 1923. 7 Serial No. 655,619.

and State of Ohio, have invented new and useful Improvements in Screw Drivers, of which the following is a specification.

This invention relates to screw drivers and similar tools.

One of the main objects of the invention is to provide a screw driver of simple and durable construction which may be readily produced at small cost. A further object is to provide a screw driver having a handle of electrical insulating material, the portion of the shank of the screw driver which is enclosed by said handle being so constructed as to insure securement of the handle and produce a structure of great strength capable of withstanding the strains to which it is subjected in use including those due to striking the handle upon the end which is often done with such tools. A more specific obj ect is to provide a screw driver of somewhat simpler constructionwhich may be produced at lower cost than the screw driver disclosed in my co-pending applica tion for screw driver filed June 26, 1922, Serial Number 570,834t. Further objects will appear from the detail description.

In the drawings Fig. 1 is a side view of the screw driver;

Fig. 2 is a side view partly in section;

Fig. 3 is a section taken substantially on line 33 of Fig. 1.

In making the screw driver I provide a shank 1 shaped at its lower end to form a blade 1*. The upper portion of this shank is bent into sinuous or undulatory form to provide a plurality of alternately oppositely directed bends'Q, 3 and 4: which pro ect laterally of the shank l, the depth of these bends increasing toward the upper end of the shank. A handle 5 of rubber or other suitable electrical insulating material is moulded about the bent portion of 1 of shank 1 and the bends 2, 3 and 4c serve to effectually secure the handle in position, these bends also providing means whereby suflicient leverage is obtained for turning the handle when using the tool. The screw driver constructed in this manner possesses the requisite strength and may be readily produced at very small cost since the portion 1 of the shank for receiving the handle 5 can be quickly formed by a simple bending operation. Preferably, though not necessarily, the portion l hasits front and rear faces slightly flattened at 1. This is of assistance as an additional means for effectively securing the portion 1 in the rubber of-handle 5 and eliminating all possibility of turning of the handle-about the upper portion of the shank. The shank l, including the blade 1 and the handle 'receiv ing portion 1 is all formed of one piece of material by a simple'pressing and bending operation, and the handle is readily moulded about portion l of the shank, so that the screw driver can be readily produced at very small cost, while possessing very high efficiency. Moreover, it will be noted that the sinuosity of the portion" of the shank embedded in the insulating material of the handle presents a series of obstructions to the movement of the handle longitudinally of the shank which will offer a more or less resilient resistance to such movement rather than a positive abutment, so that when as often happens, the tool is struck upon the end of the handle there is a more effective transmission of the force of the blow to the shank than if the shank were straight without the'injury to the material of the handle which would result from any more abrupt shouldering of the shank. Nhile I have illustrated and described the invention as.

applied to a screw driver, it will be understood that it can be applied to various other tools as well.

lVhat I claim is A screw driver or like tool in which a shank and handle are combined to transmit either an end thrust or a rotary motion comprising a tool shank having a fiat sinuous extension and a handle of stiff resilient and insulating material moulded upon the said sinuous portion of the shank.

In testimony whereof I aflix my signature.

HARVEY J. HARROLD. 

